Preparation of silicon carbide from organosilicon gels: I. Synthesis and characterization of precursor gels

Journal Article · Thu Jan 01 04:00:00 EST 1987 · Advanced Ceramic Materials; (USA)

DOI:https://doi.org/10.1111/j.1551-2916.1987.tb00052.x· OSTI ID:6363658

White, D A; Oleff, S M; Boyer, R D; Budinger, P A; Fox, J R ^[1]

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1. Standard Oil Research and Development Center, Warrensville Heights, OH (USA)

Polymeric organosilicon gel precursors to SiC have been prepared using trifunctional chloro and alkoxysilanes that contain both the Si and C necessary for SiC formation. Crosslinked gels having the ideal formula (RSiO{sub 1.5}){sub n} have been synthesized by a hydrolysis/condensation scheme for a series of saturated and unsaturated R groups. The starting gels have been characterized by elemental analysis and by a variety of spectroscopic and physical measurements including Fourier transform infrared spectroscopy, XRD, surface-area and pore-volume determination, and thermal gravimetric analysis. {sup 13}C and {sup 29}Si solid-state NMR analysis proved to be particularly powerful for characterizing these gels by showing the degree of crosslinking and the residual hydroxy/alkoxy content. Under an inert atmosphere, the gels decompose to produce an intimate mixture of C and SiO{sub 2} which can react to form SiC at higher temperatures. The pyrolysis of these gels to produce SiC is described in Part II.

• OSTI ID: 6363658
• Journal Information: Advanced Ceramic Materials; (USA), Journal Name: Advanced Ceramic Materials; (USA) Vol. 2:1; ISSN 0883-5551; ISSN ACEME
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CARBIDES
CARBON COMPOUNDS
CHEMICAL ANALYSIS
CHEMICAL PREPARATION
COHERENT SCATTERING
CRYSTAL STRUCTURE
DATA
DIFFRACTION
EXPERIMENTAL DATA
GRAVIMETRIC ANALYSIS
INFORMATION
INFRARED SPECTRA
INORGANIC POLYMERS
MAGNETIC RESONANCE
MEASURING METHODS
MICROSTRUCTURE
NUCLEAR MAGNETIC RESONANCE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
POLYMERS
QUANTITATIVE CHEMICAL ANALYSIS
RESONANCE
SCATTERING
SILICON CARBIDES
SILICON COMPOUNDS
SPECTRA
SYNTHESIS
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION